Pneumatic tube



ASGG? Maw 29, M923.

M. REBOLLAR Y PLANCb-V PNEUMATIC TUB E Original Filed May 25, 1920 3 Sheets-Sheet l Maly 29, 11923. IS?? M. REBOLLAR Y PLANCHT PNEUMATIC TUBE Original Fled May 25; 1920 3 Sheets-Sheet 2 M. REBOLLAR" Y PLANCHT May y29, 1923.

PNEUMAT I C TUBE ,v 1920 3 SheetS--Sheeil 3 Original Filed May 25 Patented lll/lay 29, 1923.

untreu stares MaUnrCIo REBOLLAR Y PLANCHT, or HABANA, cone.

PNEUMATC TUBE.

Application filed May 25, 1920, Serial No. 384,105. Renewed February 5, 19253.

To all` whom it may concern:

Bc it known that l, MAUnioio RnnoLLA'n Y PLANCHT, a citizen lof the Republic of Cuba, and resident of Habana,-Cuba, have invented o certain new and useful improvements in Pneumatic Tubes, of which the following is` a complete, full, and clear specification.

This invention relates to pneumatic tubes used in combination with resilient tires for io automobile wheels and its main object 'is to provide these tubes at the inside thereof `iaith an attachment which permits to maintain constantly therein the previously regu'- lated inner duid pressure, by feeding` the air that might be required for completing the pressure within the pneumatic tube or either by expelling' out such air causing a higher pressure therein than a, predetermined pressure, thus preventing a reheating of the tube. An advantage of the invention lies in the fact that the operation of the attachment is effected automatically and the latter is ot such special construction that renders impossible the going out of operation thereof. fi further object. is that notwithstanding the eiiicientoperation of such construction, same is Very simple.

rlhe iiifention is described with reference t the figures ofthe annexed drawings, in

is vertical cross section of an provided with the improvement udinal vertical section of :owing tne attachment parsection on a of section of detail in vertical section similar Ll, snowing a modified posio.' valves.

a lnorizontai section on line tiene a horizontal section on line 7 7 a horizontal section on line 8-8 a horizontal section on line 9--9 oi nig.. u n i 'Fi 10 is a horizontal section on line itl-10 of big.v 2.

e su gectniatter of this inventionv Fig. 11 is a horizontal section on line 11-11 of Fig. 2.

Fig. l2 is an upper plan view of a. form of .spring used inside the attachment.

-wall in the shape of a pear and made of a flexible material such asrubber and fabric and composed of four -sections integrally connected together` to wit: a lower section 2 in the form of an inverted cone, a short cylindrical Zone 3, a higherfsection of'trunk cone shaped el' whose verter: is united with the lower vertex of anupper section 5 of inverted cone shape, the latter terminating in a peripheral bevel cut 6 and the upper plane Wall 6. Each section compriscstwo spaciatedconcentric walls 7 and 7 constituting an annular chamber 8 which extends through the sections 2, 3, l and the annular chamber 9 in the upper section 5,l the chamber 9 beingl preferably of a thickness which is somewhat less than chamber 8. ln this chamber 8 is lodged the helical spring 10 which terminates at the neck 11 where the trunk cone placedin radial vposition inside the pneumatic tube 13 `generally used iii the tiresv of vehicle `wheels.' The lower end or vortex of cone 2 is flat so as to be adapted to the inner face of the pneumatic tube 13 through the intermediate of the rubber reinforcenient 14C and is secured .thereto by means of the rivet 15 interiorlyending in a fiat head or disc 15. inside the inner chamber 17 of the air casing- 1 projects downwardly in a hanging manner from the union point between tlie cone sections 5 and Li, the pipe 16 which is open above and below and terminates near the upper face of disc 15 and which communicates the chamber 17 with the chamber 17 inside the upper section 5, and is provided near its lower end with holes 16 for letting out the air from the firstto the second chamber in the event of there being deposited at the bottom of the rst one liquids derived from the condensation of vthe moisture of the air or dust penetrating tion of such liquid or dry residues. Through a central opening in the upper wall 6 of the air casing there is mounted the lower end of a cylindrical valve-bearing metallic member 19 outerly threaded throughout its length and which is widened lowerly forming a ripheral flange 20 which bears'fagainst the inner face of the upper wall 6 and being.

closely fitted to 'said rim by means of the nut 21 andithe washer 23 thereinbetween. `This valve-bearing member 19 is hollow inside soas to constitute a cylindrical central valve case 23 in whose wall and at its lower end vthereare the diametrally opposite vertical recesses 24 inside of which slide the lugs 25 l fixed atthe top of valve 26 formed by a cyi lindrical body terminated at its bottom 1n trunk cone shape and which is extended downwardly for constituting a stem 27 which enters in a hollow cylinder28 terminated in the" conical head 30 which ismounted on the inner :face of the inner wall of the upper section v The valve 26 is connected at itstop to the upper end of a helical spring 31' connected at its top end to the obturatng [valve 32 which slides within the tubular hole 33 arranged in vertical alinement with the valve case 23 and being an extension thereof, but ofmino'r section,h serving as seat to this upper valve the beveled edge of opening 32' in the partition 32` incontinuation whereof and o'nthesame alinement there is the vertical central hole 33. In a direction Jfrom above to be'lowf the member 19 there are and 39 are securely pending from the helical' springs 44 and 45 connected at their upper straight end to a plane cover or disc 46 constituting a safe valve closing the four holes .34, 35, 36 and 37 and-which is fitted around a pipe 47 whose lower end screws inside the upper end of central hole 33 of member 19 `and accordingly in communication with the conduit 33. From the upper face of said cover or disc 46 projects' upwardly conical heels 49 on which bear another upper' disc 50 which is also ttedaround pipe 47 and on said disc 50 rests a helical spring 51 cile'd around th'e pipe 47, said spring bearing. at its upper end against the lower faceof the grooved border nut 52 threadedon the upper -end of pipe 47 the latterbeing provided at its upper free end with a sieve 47. "Upperly closed by the cover 46 there is provided at the top of member 19 a be eled annular recess 53 which communicat s the fourrertical holes 34, 35, 36 and 37. 54 designates a cylindrical shell terminated in an upper slpherical .casket 55 and which is outerly t readed on the upper end of member 19, this shell being.provided with side openings 56 and 56 at liferent heights and is divided inside in two compartments, an upper aspirating one and a lower expulsating one by the horizontal partition 57 and located between the two series 'of openings 56 and 56' the spring 51 coiled thereon. The holes 35 and 37 arecontinued in sections 35 and 37 of less width which are connected at their lowery ends through the transverse holes 59 and 60 with the -nipples of widened ends 61 and 62 wherein are fitted the'ends of the hoses 63 and 64 made of rubber and canvas orany other` similar material and which are terminated in widened mouths 63 and 64 directed towards o posite sides ofthe pneumatic tube 13 in the longitudinal direction v'15 and through which passes the pipe 47 with of the latter. In -hole 35 there is provided a beveled valve 58 whichrests on the shoulder 58 fortned bythe lower hole extension 35 and which valve pends'from the spring 58" united at its upper straight end to the cover46. The member 19 is secured to the wall of the pneumatic tube 13by means of the beveled border nut 65 which is threaded on the lower portion of theformer inside the tube 13g the upper face of this nut being in contact with the inner face of the. tube -wall and by means of the nut 66 threaded also on said member at the outside of tube 13 and pressing this with ,the intermediate of`the metallic bell 67 adapted tothe upper neck 68 of the tube. Finallyl 69designates a screw which acts as .a stop cock through an' opening 70 communicating the hole 33 Awith the exterior and A71 designates a nut threadedron member 19 and which is -intended to hold the same in position through the rim of the wheel to which the pneumatic tube 13 is adapted. As a modification which can be effected in the construction of the attachment described, there is illustrated in Fig. 13 a reinforcing spring for casing 1 which is formed ofconcentric loops 72 instead of helical springs, and which are connected together by three double canvas 'bands 73 which are extended inside andoutside of the loops and conforming to the irregularities formed by the various sections of casing 1 in its vertical section and which are sewed up to the loops 72.v

The operation of a pneumatic tube provided with the improvements forming the subject matter of thisinvention is as follows:

For injecting air into the pneumatic tube 13 the' shell 54 is removed and -there is connected with' the1end of the tubular stem 47 the feed pipe of any common type of air in )ecting pump, .whereby .the air ypasses resaca? through the central hole 33 to hole 23, fill ing the holes 17 .and 17 of the air casin 1 and also passes `through the transverse ho es 42 and 43 to the longitudinal holes 34 and 36 until coming to the upper recess 53 closed by the cover 46 and from there it passes to the valveless longitudinal, hole 37 and through the transverse hole 60 goes to the hose 64, thus feeding with air the interior of the pneumatic tube 13 until obtaining the required pressure which is previouslyfregulated by the tension of spring 51 of the safety valve. i Once the vehicle moves ttorV ward, if there is the required pneumatic pressure, the air casing 1 will be kept expansioned by the same inner pressure of the pneumatic tube aided by the expansion ot vthe inner springs 10 and 12, but when lacking the required pressure in the interior-of the pneumatic tube 13 the weight of the vehicle compels the walls of the air casing to flatten down wherebythe cylindrical body 28 will ascend closing against the valve 26 and pushing upward the latter and with it the spring 31 and the valve 32 against its seat 32 so that closing the valves 26 and 32 and compressing the air confined in cham-y ber 17 of thev upper section 5 of casing 1 when the latter is flattened down, same is compelled to be introduced in the transverse holes 42 and 43'and to pass to the vertical holes 34 and 36 to raise or open the valves 38 and 39 and continues through the holes where saidvalves slide enters the beveled annular recess 53 and descends through the hole 37 lromwhere it passes to the air injecting hose 64 in the pneumatic chamberv 13. Owingto the fact that the spring provided in the upper section 5 of the casing is ot less thickness than that of the other sections 2, 3, and 4 ol casing 1, said upper section 5 is wholly flattened down, but notwithstanding this, if the lack of pressure of the tube would be exceedingly short, this would result in the whole flattening down of the,

air casing l and the compressed air ol the inner chamber l? would raise the valve 26 from its seat 23 alter passing through pipe i6 and the air will be guided towards the holes 34 and the same manner previously used, andi 'thence through the recess 53 to hole 37 and hose 33, into tube 13.

lt for any reason whatsoever the pressure in the pneumatic tube be i raised. said pressure will odset the tension or" the spring 5l which regulates the safety valve and the air raises the cover 46 andy escapes ouft 'through openings 56 alter having passed through the hose 63 and 64 'and holes 35 and 37, and having raised the valve 58. The hose 33 which is connected to the valve case 35 does not permit the access of the air to the pneumatic tube 13 but serves only for the expelling out of the air or any other strange body thatl might be inside the pneumatic r ln those cases wherein the pressure inhthe kpneumatic tube be the normal or required one, it will not take place the flattening down of the air casing and in case of such smashing taking place and the attachment operating without necessity, the4 valves should be open themselves thus letting out the air. lt is quite desirable to insert alv piece of cotton in Kthe inner end of the shell 54 with the aim in View of preventing the entrance of dust and maintaining nevertheless the required circulation of air through said holes between the apparatus and the atmospheric air.

lt is obvious that many changes can be made in the described improvement as well asadapting my invention to all the purposes to which its construction might serve, whereby l do not limit myself to what has been described, but desire that the Letters- Patent may cover all that which is within the scope ofthe appended claims.

What l claim is:

1. ln'pneumatic tubes, a fluid collapsible closed supplemental container arranged in a pneumatic tube, a fluid feeding member from the exterior which is connected tov said supplemental fluid container and which passes through the wall ot the pneumatic tube, said" member being provided with a central longitudinal bore to which is connected a pressure fluid feeding tube and which hole serves as seat for valves connected through a helical spring, one oli' said valves being arranged to open inwardly and the other being-arranged to slide in an enlarged extension of said bore in combination with aseatfformed'at the interior of the supplemental fluid container, said memoer having also tour longitudinal holes arranged crosswise around the central bore and terminating short ot the inner end of said member, two oli said holes communicate with the extension of the central bore and being provided with valves which open from inwardly, and one of the holes having outwardly opening valve, the last two mentioned holes communicating below l level ol said valve with the interior el the pneumatic tube, and the four 'ol the pneumatic tube and whose inner cavity is divided intwo compartments, an upper one of less volume and a lower one of much larger volume which are in coinlll@ munication with each other through a pipe 4which leads from the former one till neary the lower part of the second, the inlet of the upper compartment *being in connection with the fluid feedingv member of the pneumatic tube, and valves in the compartment ofless volume and inv the fluid feeding. member so that when the fluid pressure f is reduced in the interior vof the pneumatic tube there be contracted first and in a higher .degree the compartment of less volume than that of the larger Volume to compel the inner-'fluid of the former thereby compressed to supply. the pneumatic tube thus reinstating its pressure and the con-v,

traction of the compartment of larger Volume acting thereafter forsupplyingmore fluid to the pneumatic tube if required.

'3. In pneumatic tubes, a supplemental closed Huid container,A collapsible through the flattening down of its walls and arranged. in the pneumatic tube and whose inner cavity is divided inl two compartments, an upper one -ofyless volume and 'whose walls yields in less degreelthan the walls of the lower compartment which is of largerV volume, both compartments being in communication with one another through..

a tubel which leads from the former towards near the bottom of the second one, a cylindrical fluid feeding member from the exterior which is connected with the upper compartment of the supplemental fluid.

containerand passes through', the wall of the pneumatic chamber, said member vbeing provided with a central longitudinal hole connected to a pressure fluid feeding tube from the exterior andwhich hole serves as lodgin for two opposite valves connected throng a helical spring and of'which one opens inwardly and the other one loosely slides through suitable ides inside an eX- tension of said central ole,`in combination vwith a seat formed in ay cylinder connected to the bottom of the upper compartment of the supplemental fluid container directly above the tube communicating both compartments, said v member being alsol provided with four longitudinal holes arranged crosswise around the central hole and terminat-A the top of the said member by an annular i recess,y a disc cover closing this -recess and which is ti htened by the tension of aspring coiled on tile pressure lluidlfeeding tube and whosetension is'regulated by a nut screwed on said tu'be, said cover acting as a safety valve. v

'In witness whereof I afix my signature.

' MAURlCl REBOLLAR y PLANCHT. 

